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Method fft() faster about 10%#76

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xtonik wants to merge 2 commits intowrandelshofer:mainfrom
xtonik:METHOD_FFT_OPTIMIZED
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Method fft() faster about 10%#76
xtonik wants to merge 2 commits intowrandelshofer:mainfrom
xtonik:METHOD_FFT_OPTIMIZED

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@xtonik xtonik commented Jun 21, 2023

Optimization done using trivial trick reusing results two additions. Surprisingly it is slower than use strict equation. It become more performant about 10% after reduction of number of instances ComplexVector(). Tiny improvement provided by changed counting of the indexes.

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